Electrical transport through single nanowires of dialkyl perylene diimide

Beom Joon Kim, Hojeong Yu, Joon Hak Oh, Moon Sung Kang, Jeong Ho Cho

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We investigated electrical charge transport through individual strands of single-crystalline dipentyl perylene tetracarboxylic diimide (PTCDI-C 5) and dioctyl perylene tetracarboxylic diimide (PTCDI-C8) nanowires prepared by a solution-phase self-assembly method. Temperature-dependent mobility measurements (100-280 K) revealed distinct electrical transport characteristics in the two types of nanowires. The PTCDI-C8 nanowire having shorter intermolecular distances exhibited a transition in the electrical transport mechanism from a thermally activated process (the multiple-trap-and-release model) to a band-like transport (the signature of excellent electrical conduction) with increasing temperature. In contrast, the transport through the PTCDI-C5 nanowire was mostly determined by thermally activated behavior. The observation of band-like transport in the PTCDI-C8 nanowire was attributed to the small number of charge traps in the constituent molecules. Meanwhile, band-like transport was hardly attainable in the PTCDI-C5 nanowire due to the presence of a large number of charge traps, which followed an exponential energy distribution. Unlike the case of the single-crystal PTCDI-C8 nanowire, thin films of polycrystalline PTCDI-C8 contained significant numbers of exponentially distributed charge traps. Consequently, band-like transport was not observed. Overall, our results presented here demonstrate the importance of attaining good molecular ordering and orientation within the electrically active molecular layer with a high electronic purity for achieving superior electrical transport, i.e., band-like transport.

Original languageEnglish
Pages (from-to)10743-10749
Number of pages7
JournalJournal of Physical Chemistry C
Volume117
Issue number20
DOIs
Publication statusPublished - 2013 May 23

Fingerprint

Perylene
Nanowires
nanowires
traps
strands
Self assembly
Charge transfer
self assembly
energy distribution
purity
signatures
Single crystals
Crystalline materials
conduction
Thin films
Temperature
Molecules
temperature
single crystals

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Kim, Beom Joon ; Yu, Hojeong ; Oh, Joon Hak ; Kang, Moon Sung ; Cho, Jeong Ho. / Electrical transport through single nanowires of dialkyl perylene diimide. In: Journal of Physical Chemistry C. 2013 ; Vol. 117, No. 20. pp. 10743-10749.
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Electrical transport through single nanowires of dialkyl perylene diimide. / Kim, Beom Joon; Yu, Hojeong; Oh, Joon Hak; Kang, Moon Sung; Cho, Jeong Ho.

In: Journal of Physical Chemistry C, Vol. 117, No. 20, 23.05.2013, p. 10743-10749.

Research output: Contribution to journalArticle

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